Using the fuel economy information allows consumers to make "a more educated decision that will help conserve energy and save money," Energy Secretary Samuel W. Bodman said.

Testing by the EPA and manufacturers determine fuel economy estimates, which are displayed on new vehicles' window stickers, the EPA said.

EPA officials said they proposed changing testing methods to more accurately reflect what drivers experience on the road. The changes are expected to be finalized in time for its 2008 model rating, the EPA said.

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